300 MR WALTER E. COLLINGE ON THE 



Urocyclus Jlavescens, Kerfst., agreed pretty well with that of Parmarion papillaris, 

 Himib., and Girasia extranea, Fer. : but I am not of this opinion (cf. Semper, Reis. 

 Arch. Philip., p. 11). The literature relating to the Asiatic and Malayan slugs and 

 slug-like molluscs abounds in similar inaccuracies. The two forms (Urocyclus Jlavescens, 

 Kerfst., and Parmarion pupillaris, Humb.) are widely separated from one another, 

 externally, anatomically, and geographically. 



WlEGMANNIA, II. gen. 



Animal Parmarion-like. Anteriorly the dorsum is marked with two lateral 

 grooves, which, commencing from the sides of the head, converge towards the median 

 line, and then pass to the right and left respectively. There is also a conspicuous row 

 of rugse passing between these two lateral grooves in the mid dorsal line. Posteriorly 

 the dorsum is keeled. The mantle shows faint traces of a keel, and has a thin shell 

 border more or less covering the borders of the shell. Visceral mass large and lying 

 upon a depression of the dorsum. Generative orifice immediately behind and below 

 the right lower tentacle. Tail truncate, with large slit-like mucous pore which extends 

 to the foot-sole. Dart-gland and sac large ; dart with solid, calcareous tip. Penis has a 

 small diverticulum. Receptaculum seminis sessile. 



Shell a thin membranaceous sac, covering the posterior border of the visceral 

 mass. 



1. Wiegmannia dubius, Wgm. 



Parmarion ? dubius, Wgm. : Abhandl. d. Senck. naturf. Gesell., 1898, Bd. ii. p. 105, T. xxi. figs. 27-40; 

 T. xxii. figs. 1-6. 



For purposes of comparison, I have reproduced Wiegmann's figures of the externa] 

 portion of the head and parts of the generative organs (PI. II. figs. 24-26), from which, 

 1 think, it will at once be evident that this species belongs to the same genus as the 

 following specimens. 



One point to be noted is that Wiegmann failed to find in either of his specimens 

 any dart. He writes (14, p. 298): " Wahrend namlich die weibliche Anhangs- 

 driise bei der Species von Java, ebenso wie bei P. pujrillo.ris nach Semper, nut einem 

 Kalkigen Pfeile von sehr charakteristischen Form versehen ist, fehlt dieser ganzlich 

 den beiden vorliegenden Tieren von Borneo, bei welchen die Pfeildrlise in einen durch- 

 bohrten fleischigen Papille endigt." Judging from the figure of this fleshy papilla 

 (14, Taf. xxi. fig. 40, and reproduced here on PL II. fig. 26), it has all the characters 

 of a fundus, showing a dart in course of formation. 



2. Wiegmannia gigas, n. sp. 

 PI. I. figs. 6-8; PL II. figs. 27, 28. 

 Animal greyish-brown, with few blackish blotches on the sides of the body 

 posteriorly. Head and tentacles dark blue, lateral grooves prominent, median line 



